Thermometer and gauge tube



s. LlGo'rz THERMOMETER AND GAUGE TUBE Filed Nov..25. 1923 FE1- EE-- EEE- FE? Patented ug. 24, 1925.

' STEPHEN LIGQTZ, 0E NEW YORK, V'N. Y.

U THERMOMETER AND GAUGE TUBE.

n Application filed November 23, 1923. Serial No. 678,604.

This invention has-relationVtomeasuring 'instruments and has particular reference to thermometer or gauge tubes.k v

As an object ,the present invention contemplates a thermometer or gauge tube which effects the magnicationbf the column of `fluidwithin the samewhen viewed from opposite sides thereof, vwhereby the reading of the same is facilitated fromvboth sides ofthe instrument of-.whieh it forms a. part.

' Furthermore the invention comprehends a thermometer or gauge tube kwhich is formed with diametrically.disposed mean. adapted 'i for engagementA with vseparated l; scaled dial sections between the confronting edges of which the tube is arranged.

As a still further object the invention contemplates an improvement in thecross sectional shape of thermometer tubes and the bores of the same, which coact to increase or augment the magnification of the fluid column.

As a still further object the invention aims vto provide a thermometer or gauge tube, the cross sectional shape of the bore and exterior of which combine to minimize visual separation of the magnified fluid column when the tube is viewed'at an angle.

The invention furthermore contemplates an improvement in thermometer or gauge tubes Vwhich does not materially increase the cost of production and which is highly efficient in its purpose.

With the above recited and other objects in view, the invention resides in the novel construction set forth in the following specication, particularly pointed out in the appended claims and illustrated in the accompanying drawings, it being understood that the right is reserved to embodiments other than those actually illustrated herein to the full extent indicated by the general meaning of the terms inV which the claim is eX- pressed.

In the drawings- Figure 1 is a front view of a gauge orv other similar instrument equipped withV a tube constructed inV accordance with the Ainvention, the tube'being partially broken away and shown in section. a

Fig. 2V is a cross sectional view taken' approximately on the line 2-2 of Fig. 1. Fig. 3 is a face view of a modified form of tube with a Vpart thereof shown in section.

v`Fig-t is a sectional view therethrough taken-on the-line 4:-4 of Fig. Y g

Fig. is a. face view of a further modification, illustrating the. tube partlyrin vsec-.

tion. y y

Figpt is a transverse sectional v.view therethroughtalen approximately on the line 6,-6ofFig.5. v.-

' Fig. 7 is a face view of a still further modification with a part of thertube shown in section. V A l .y .1 r

Fig. S is a transverse-sectional view therethrough taken approximately onY the linev 8 8 of Fig. 7

Figs. 9, io, ii views of further modified forms of the invention.

Referring to the drawings by characters of reference the tubes 10 are provided with two pairs of opposing faces 11 and 12, the faces of said opposing. pairs being disposed at an angle to each other. As specifically illustrated in Figs. l to 8 inclusive, the opposite Ycorners constituting` the sides of the tube are grooved as at 13, while the front andV rear corners 14 are rounded. 'Ihe grooved sides 13 are adapted to receive the confronting inner edges of the scaled dial sections-15 of the instrument with which the tube is associated. As specifically illustrated in Figs. 1 and 2, Ythe bore 16 is of a non-.

circularshape with the major axis in alignment with theV grooved sides. By construct- 'ing a thermometer kor gauge tube in this manner the magnification of the 4column of iiuid within the tube is effected from both faces. It will also be vobserved that a more accurate gauging or reading of the column in connection with the scaled dial sections may be obtainedwhile the tube constitutes a substantially transparent medium for'the passage of light throughthe instrument. Furthermore by providing a non-circular bore "16 having its major axis transverse to the facesof the tube'a wider column is presented toview which when magnied still further augments the visual width of the column. In Figs. 3 and 4f thevtube 10a is of substantially the same construction as that illustrated in Figs. 1 and 2 with the exception'that in'this instance the bore 16a is circular. In Figs. 5 and 6 thev faces 11b and 12b of the tube 10b are concaved, which combined with the non-circular bore 16b having its lmajor axis transverse to the reading and 12 are cross 'sectional y11o Y i faces minimizes the Visual separation of the n'iagnilied column due to the viewing,- of the tube from a point at an angle to the reading faces. This apparent separation or subdivision of the column is a connnon one oc eurrng Whenever two prisnis are placed be tween the observer and the object observed in such a manner that the image of the object appears on both prisms. 1n the present case the visual separation occurs when viewing the mercury eolunin from an angle at which the column is seen directlyT through one ot' the concave tacos and siniultaneouslgY a reflected image is seen through the convex face. The convexity of the faces 11c and l2, as illustrated in Figs. and S, Yfunctions in a similar manner with a round bore 162.

In the modified adaptation illustrated in Fig. 9 the pairs of opposed taces 11 and l2 are formed with flattened trices 17d at their point of juncture constituting' the sides of the tube to allow for abutting engage ment oi the faces 1Tli with the confronting inner edges of a pair oi separated dial sections.

In Figs. 10 similar flattened side faces 18* are illustrated as combined with a tube having concaved pairs of confront-ing faces 11e and 12.

1n Fig. l1 the tube 10f is illustrated provided with a single shoulder 191 on each side edge 'for engagen'lent with the separated dial faces ot' the instrument.

In the niodilied forni illustrated in Fig. 12 the thermometer tube 10g is illustrated as provided With a double shoulder 20g at each side edge to engage with the double separated dial sections ot' an instrument of which the tube forms a part.

A glass tube for gauges, thernioineters or the like, comprising a length of material having two pairs ot' opposing concaved faces, the taces ot said pairs being at an angle to each other whereby the column oi fluid within the bore otI the tube is magnif tied and whereby the visual separation ot the coluinns is minimized when the tube viewed at an angle.

STEPHEN LIGrOTZ.v 

